The three most common types of slate wagon are:
This is the basic vehicle for transporting roofing slates from the quarry to the destination. Because roofing slates are relatively friable, they are packed vertically into the open slate wagons to reduce the chance they will be broken on their journey. Early designs used simple wooden rails to hold the packed slates. Later these were replaced with iron or steel railed examples of a similar design.
Slab wagons are designed to carry large uncut slabs of slate, often internally within quarries. The most common form is flat wagon (often referred to as a sled) where the slab is laid horizontally on wooden runners and chained to the wagon. A less common form is the vertical slab wagon, where two slabs are chained to an A-frame mounted on the wagon; this form of slab wagon was most famously used on the Corris Railway though other lines such as the Ffestiniog Railway also had examples of this type.
These were used almost exclusively within slate quarries. They transported waste slate from the mills to the dumps. These were often crude vehicles that were heavily abused during service. They typically consisted of a basic flat wagon with a three-sided iron body that held the waste. The waste slate was usually tipped from the wagon onto the slate tips, usually by physically tipping the entire wagon and its contents.